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PREY PREFERENCE and PREDATORY BEHAVIOR of Aurantilaria Aurantiaca (MOLLUSCA: GASTROPODA: FASCIOLARIIDAE)

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PREY PREFERENCE and PREDATORY BEHAVIOR of Aurantilaria Aurantiaca (MOLLUSCA: GASTROPODA: FASCIOLARIIDAE) PREY PREFERENCE AND PREDATORY BEHAVIOR OF Aurantilaria aurantiaca (MOLLUSCA: GASTROPODA: FASCIOLARIIDAE) Preferência de presa e comportamento predatório de Aurantilaria aurantiaca (MOLLUSCA: GASTROPODA: Arquivos de Ciências do Mar FASCIOLARIIDAE) Carlos Augusto Oliveira de Meirelles1,3, Helena Matthews-Cascon1,2 RESUMO A família Fasciolariidae é formada por espécies carnívoras que usualmente predam outros gastrópodes e bivalves. Geralmente utilizam como estratégia de predação, o lascamento de concha, meio pelo qual o predador pode alcançar as partes moles da presa. Os objetivos desse trabalho foram determinar as possíveis presas de Aurantilaria aurantiaca da Praia do Pacheco (Caucaia-CE-Brasil) e a sua preferência alimentar em condições de laboratório. As presas observadas foram os gastrópodes Pisania pusio, Tegula viridula e Stramonita brasiliensis. O experimento de preferência de presa foi executado acondicionando um predador em um aquário de 5 litros com um indivíduo de cada presa, sendo observado durante 60 dias (replicado 10 vezes). Para a determinação do tempo de manipulação da presa, um predador foi acondicionado em uma caixa plástica mergulhada em um aquário de 80 litros juntamente com uma espécie de presa, sendo anotado o tempo de predação por duas 2 horas, durante 30 dias (replicado 10 vezes para cada espécie de presa). Aurantilaria aurantiaca mostrou preferência por Stramonita brasiliensis, o qual teve o mais baixo tempo de manipulação da presa. Pisania pusio e Tegula viridula não apresentaram resultados estatisticamente significativos (p = 0.7235 e 0.2499, respectivamente). O comportamento predatório mostrou 2 estratégias: penetração direta da probóscide e sufocamento. Não houve registro de lascamento de concha. Aurantilaria aurantiaca apresentou-se como um predador generalista, onde a variação de tempo de manipulação da presa mostrou que o predador passou por um processo de aprendizagem. Palavras-chave: Predação, Tempo de Manipulação da Presa, Mollusca, Gastropoda, Fasciolariidae, Aurantilaria aurantiaca. ABSTRACT Fasciolariid species are predators that prey on other gastropods and bivalves. They usually break prey shell to reach its soft parts. In this study, prey species that Aurantilaria aurantiaca consumes at Pacheco Beach (Ceará State, Northeast Brazil) and its prey preference in laboratory conditions were determined. Prey species observed were Pisania pusio, Tegula viridula and Stramonita brasiliensis. Prey preference experiment was performed placing one individual of Aurantilaria aurantiaca and one individual of each prey species in a 5 liters tank. It lasted 60 days and was replicated 10 times. Handling time of predation on each prey was measured by placing one predator with one prey into separate plastic containers in an 80 liters tank. Observations were made every 2 hours over a 30-day period. Aurantilaria aurantiaca showed preference for Stramonita brasiliensis, which presented the shortest handling time. Pisania pusio and Tegula viridula didn’t show statistical significant results (p = 0.7235 e 0.2499 respectively). Aurantilaria aurantiaca presented 2 main predatory strategies: direct prey shell penetration and asphyxiating process. No damaged prey shells were observed. The predator showed a generalist predatory behavior. Prey handling time variations demonstrated that Aurantilaria aurantiaca predation act involved a training process. Keywords: Predation, handling time, Mollusca, Gastropoda, Fasciolariidae, Aurantilaria aurantiaca. 1 Laboratório de Invertebrados Marinhos - LIMCE, Universidade Federal do Ceará, Centro de Ciências, Departamento de Biologia, bloco 909 Campus do Pici. CEP. 60455-970, Fortaleza, Ceará, Brazil.Email: [email protected] 2 Instituto de Ciências do Mar (LABOMAR), Universidade Federal do Ceará, Fortaleza, Ceará, Brazil. 3 Programa de Pós-Graduação em Engenharia de Pesca – Universidade Federal do Ceará, Fortaleza, Ceará, Brazil. Arq. Ciên. Mar, Fortaleza, 2016, 49(2): 23 - 32 23 INTRODUCTION have been explained by OFT (Abe, 1989; Hughes & Burrows, 1993). Sih & Christensen (2001) have A predator has to make decisions about what, concluded that the OFT could explain the prey where and when to eat (Krebs, 1977). According to selection if the predator feeds on sessile species. optimal foraging theory (OFT), the feeding strategies According to Yamamoto (2004) there is not enough presented by an organism are designed by natural information to explain the prey selection of predators selection to maximize its net rate of food intake that feed on the two types of prey species (sessile (Krebs, 1977; Hughes, 1980). and mobile). Generalist predators have an important role in The biggest problem in evaluating the com- the community structure: they stabilize prey position of prey in the natural environment neither populations and affect the diversity of their is that the observation of the predatory behavior communities through prey selection (Menge & (observed diet) nor always indicates the composition Sutherland, 1976; Alford, 1989; Kurzava & Morin, of natural prey (real diet). A reason for this 1998; Lambinet al., 2000). Few studies have discrepancy is the regularity of foraging behavior in quantitatively analyzed prey selection or prey the intertidal zones (Yamamoto, 2004). Although composition of generalist predators (Spiller & many predators have different foraging behavior Schoener, 1990; Wootton, 1997; Eisenberg et al., 2000). patterns between high tide and low tide, many of the Feeding strategies may also differ with studies were lead during low tide (Fairweather & relation to the number of prey items eaten. Dietary Underwood, 1983; McQuaid, 1985; Moran, 1985b; generalists eat wider ranges of prey than dietary Abe, 1989). Another reason is the difference in specialists (Curio, 1976). Specialization should be handling time in different types of prey, where those effective enough to achieve optimal hunting success that demand a bigger time are more frequently but at the same time it should not be so rigid as to observed (Peterson & Bradley, 1978; Fairweather & prevent the predator from changing from a particular Underwood, 1983; Abe, 1989). and originally preferred prey species when that The gastropod family Fasciolariidae is formed species becomes rare (Curio, 1976). by carnivorous species, usually preying on bivalves The food value of different food items can be and others gastropods (Fretter & Graham, 1962; compared by measuring their size, handling time Paine, 1963; Owen, 1966; Matthews-Cascon et al., (the time that a predator takes capturing, subduing, 1989; Meirelles & Matthews-Cascon, 2003). It is consuming, and digesting a prey) and / or caloric attributed for this family, as strategy of predation, content (Matthews-Cascon, 1997). the prey shell chipping, means by which the predator The diet type and variety of mechanisms that can reach the soft parts of the prey (Hughes, 1986). are used in the search of food presented by members Paine (1963) studied the alimentary preference of Gastropoda are amazing if compared with other and the predation rate of Triplofusus giganteus animal groups (Ankel, 1938; Graham, 1955; Owen, (Kiener, 1840) in Florida, determining that this 1966). They show all different types of alimentary species is a generalist predator, also preying animals habits: herbivores, deposit-feeders, suspension-fee- of the same subfamily as Cinctura hunteria (Perry, ders, scavengers and parasites (Hughes, 1986). The 1811) and Fasciolaria tulipa (Weisbord, 1962). main structure that allows this extensive alimentary On the predation of Aurantilaria aurantiaca variation is the complex formed by the radula/ (Lamarck, 1816) two studies have been conducted: buccal cavity (Owen, 1966). one by Schmitt (1994), that affirms its alimentary Some studies have been carried through preference in laboratory conditions for Fissurella evaluating aspects of behavior of gastropod preda- rosea (Gmelin, 1791) and the process of predation tors using the optimal foraging theory (OFT) involves the braking of prey shell. The other Meirelles (Menge, 1978; Hughes & Dunkin, 1984a,b; Hughes & Matthews-Cascon (2003) analyzes the relation that & Drewett, 1985; McQuaid, 1985; Abe, 1989; exists between shell size and radula size in 14 species Burrows & Hughes, 1989; Duarte, 1990; Palmer, of marine prosobranchs with different types of diet. 1990; Richardson & Brown, 1990; Hughes et al., Aurantilaria aurantiaca showed no significant result 1992; Richardson & Brown, 1992; Hughes & for this relation, demonstrating that radula size does Burrows,1994; Etter, 1996; Brown, 1997; Meirelles & not interfere on the prey processing. Matthews-Cascon, 2003). In the present study, predatory behavior and However, certain foraging behaviors of prey preference of Aurantilaria aurantiaca in labo- gastropod predators in the intertidal zone could not ratory conditions were investigated. 24 Arq. Ciên. Mar, Fortaleza, 2016, 49(2): 23 - 32 MATERIALS AND METHODS Eighteen adult animals of A. aurantiaca were collected manually, kept in plastic boxes with Field Studies constant aeration and transferred to the Laboratory of Marine Invertebrates of the Department of Biology During the year of 2005, monthly observations – Universidade Federal do Ceará (UFC). Also the of predatory activity of Aurantilaria aurantiaca (Figure possible prey species available for the experiment in 1) were made, during the low tides, at Pacheco Beach laboratory were collected. (3o 41’S; 38o 37’W), Ceará State, Northeast Brazil (Figure 2), to determine
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